Journal
PHYSICAL REVIEW B
Volume 73, Issue 2, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.73.020101
Keywords
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Funding
- Engineering and Physical Sciences Research Council [GR/S81155/01] Funding Source: researchfish
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We present an investigation of systematic trends for the self-interstitial atom (SIA) defect behavior in body-centered cubic (bcc) transition metals using density-functional calculations. In all the nonmagnetic bcc metals the most stable SIA defect configuration has the < 111 > symmetry. Metals in group 5B of the periodic table (V, Nb, Ta) have significantly different energies of formation of the < 111 > and < 110 > SIA configurations, while for the group 6B metals (Cr, Mo, W) the two configurations are linked by a soft bending mode. The relative energies of SIA defects in the nonmagnetic bcc metals are fundamentally different from those in ferromagnetic bcc alpha-Fe. The systematic trend exhibited by the SIA defect structures in groups 5B and 6B transition metals correlates with the observed thermally activated mobility of SIA defects.
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